<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="http://localhost:3000/login" method="post">
        <input name="username" type="text" placeholder="输入用户名" /><br>
        <input name="password" type="text" placeholder="输入密码" /><br>
        <input type="submit" value="登录" />
    </form>
</body>
</html>